The server in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 does not correctly handle requests…
Priority LOW 31CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
The server in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 does not correctly handle requests for byte sequences, allowing an attacker to amplify the response size by requesting the entire response body repeatedly, as demonstrated by an HTTP Range header value beginning with the "bytes=0-,0-" substring.
Why it matters now
EPSS 0.01239 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:* | before 1.5.0 | Vulnerable | litespeedtech |
| cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:-:*:*:*:*:*:* | 1.5.0 | Vulnerable | litespeedtech |
| cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc1:*:*:*:*:*:* | 1.5.0 rc1 | Vulnerable | litespeedtech |
| cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc2:*:*:*:*:*:* | 1.5.0 rc2 | Vulnerable | litespeedtech |
| cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc3:*:*:*:*:*:* | 1.5.0 rc3 | Vulnerable | litespeedtech |
| cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc4:*:*:*:*:*:* | 1.5.0 rc4 | Vulnerable | litespeedtech |
| cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc5:*:*:*:*:*:* | 1.5.0 rc5 | Vulnerable | litespeedtech |
- cpe:2.3:a:litespeedtech:openlitespeed:*:*:*:*:*:*:*:* Versions before 1.5.0 Vulnerable ·litespeedtech
- cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:-:*:*:*:*:*:* Versions 1.5.0 Vulnerable ·litespeedtech
- cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc1:*:*:*:*:*:* Versions 1.5.0 rc1 Vulnerable ·litespeedtech
- cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc2:*:*:*:*:*:* Versions 1.5.0 rc2 Vulnerable ·litespeedtech
- cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc3:*:*:*:*:*:* Versions 1.5.0 rc3 Vulnerable ·litespeedtech
- cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc4:*:*:*:*:*:* Versions 1.5.0 rc4 Vulnerable ·litespeedtech
- cpe:2.3:a:litespeedtech:openlitespeed:1.5.0:rc5:*:*:*:*:*:* Versions 1.5.0 rc5 Vulnerable ·litespeedtech
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-19791
- 2026-10-03 Alias added: GHSA-p7xx-c3fx-mhqh
References
More litespeedtech Openlitespeed vulnerabilities
- TI-2022-00030 Authenticated Remote Code Execution in OpenLiteSpeed Web Server CVSS 3.1HIGH 8.8
- TI-2020-04489 The WebAdmin Console in OpenLiteSpeed before v1.6.5 does not strictly check request URLs… CVSS 3.1CRITICAL 9.8
- TI-2021-08426 Privilege Escalation in LiteSpeed Technologies OpenLiteSpeed web server version 1.7.8… CVSS 3.1HIGH 8.8
- TI-2026-23945 OS command injection in LiteSpeed Technologies OpenLiteSpeed CVSS 4.0HIGH 8.6
- TI-2022-00031 Privilege Escalation in OpenLiteSpeed Web Server CVSS 3.1HIGH 8.8
- TI-2023-21334 LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers. CVSS 3.1HIGH 7.5
Sources
- CVE-2018-19791 · CVE Program
- CVE-2018-19791 · NVD
- FIRST EPSS
- GHSA-p7xx-c3fx-mhqh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences